CRYSTENGCOMM
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2018
·Vol. 20
·期 40
·6197-6206
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IF 3.304
Yun-Chuan Xu,Quan-Ping Zhang,Jun-Hua Liu,You Wu,Li-Ping Liu,Dui-Gong Xu,Yuan-Lin Zhou
Assembling anisotropic structures with versatility such as good thermal conductivity and mechanical loading for radiation shielding has recently attracted widespread attention. Herein, a facile strategy with (3-mercaptopropyl)trimethoxysilane (KH590) as a surfactant is used to synthesize one-dimensional (1D) PbWO4 structures. Their morphology evolution and crystal phase transition are traced during the growth process by SEM, TEM, and XRD techniques, respectively. The results show that monoclinic PbWO4 nanofibers with typical single-crystal attributes and high production are obtained with the addition of 5 wt% KH590. In addition, although PbWO4 nanoparticles display a slightly high attenuation coefficient for gamma radiation, 1D PbWO4 structures exhibit better thermal conductivity, tensile strength and elongation at break. These findings indicate that the prepared 1D PbWO4 structures have a very promising prospect in the application of state-of-the-art shielding materials for gamma radiation.
研究领域:
材料科学
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辐射防护
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 44
·19013-19021
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IF 3.288
Yi Zheng,Yiliang Shao,Xingzhi Jin,Min Shu,Longxiao Zhang,Chunlei Li
The contact quality of a composite is an important factor for the transfer and separation of photogenerated carriers. For this, we demonstrated a cation exchange method for the in situ construction of WO3/PbWO4 linked by WO6 octahedral crystal structure units, where WO3 was placed on the surface of PbWO4. We found that the apparent rate constant of the as-prepared WO3/PbWO4 was significantly increased (17 times higher than any single one). Our investigation indicated a remarkably enhanced photodegradation rate, originating from high contact quality. The photogenerated carriers of WO3/PbWO4 were greatly separated via the grain boundary, making WO3/PbWO4 exhibit 22 times higher photocurrent density than pristine PbWO4. Moreover, the photoelectrons and holes were separated through the high contact quality grain boundary built-in electric field, which is in accordance with the transmission path of the Z-scheme. Compared with the interface, a grain boundary is more conducive to the photocatalytic process. This study provides a feasible strategy to build a highly efficient Z-scheme photocatalyst with high contact quality grain boundary to remove organic pollutants.
研究领域:
材料科学
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环境科学
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光催化
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Quan-Ping Zhang,Yun-Chuan Xu,Jia-Le Li,Ao-Jie Liu,Dui-Gong Xu,Ming Wei,Yuan-Lin Zhou
Increasing exposure chances of humans to low-energy gamma-rays occur with the rapid application expansion of nuclear technology, which tend to induce carcinogenic and mutagenic effects on living bodies, and then need to be protected from. PbWO 4 has excellent gamma-rays attenuating ability while Pb displays a weak shielding property of low-energy gamma-rays from 40 keV to 88 keV. Here, crystal defect engineering with Ce doping is applied to fabricate the crystal structure of PbWO 4 for tailoring its low-energy gamma-rays shielding property. Characterization with XRD , Raman, XPS, XRF , SEM and TEM techniques indicates cerium ions have been introduced into the lattice of PbWO 4 crystals during the doping process. In addition, Ce doping amount plays key roles in tuning the crystal defects in PbWO 4 including ion substitution, charge compensation and structural deformation. Importantly, PbWO 4 doped with 10 mol% Ce displays an optimal mass attenuation coefficient (2.61 cm 2 /g) to 59.5 keV gamma-rays and shows a 39% increase ratio to the PbWO 4 without doping. In addition, typically anisotropic PbWO 4 crystals are found at 40 mol% Ce doping amount, which give its potential versatility. This work provides a solution to make up for PbWO 4 to shield low-energy gamma-rays that could further promote its application in personal protection, such as clothing.
研究领域:
材料科学
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辐射防护
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核技术应用
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DOI
高影响因子
Advanced Photonics Research
·
2021
·Vol. 3
·期 1
·2100250
·
IF 0
Xue-Chen Ru,Ji-Song Yao,Jun-Nan Yang,Jing Ge,Yi-Feng Lan,Tian Chen,Zhen-Yu Ma,Yi-Chen Yin,Jing-Jing Wang,Yong-Hui Song,Li-Zhe Feng,Kuang-Hui Song,Hong-Bin Yao
All-inorganic cesium lead halide perovskite colloidal nanocrystals (NCs) (CsPbX 3 , X = Cl, Br, I) have emerged as potential candidates for next-generation light-emitting diodes (LEDs). However, high trap states on the surface of CsPbX 3 NCs caused by ionic nature and dynamic bonding of organic ligands limit the performance of CsPbX 3 NCs-based LEDs. Herein, a microemulsion (ME)-modified strategy to decorate CsPbBr 3 NC cores with inorganic PbWO 4 is developed. It is demonstrated that ME-assisted modification plays a crucial role in bridging the WO 4 2− anion solution and the CsPbBr 3 NC suspension. Compared with pristine CsPbBr 3 NCs, the obtained PbWO 4 -modified NCs exhibit improved photoluminescence efficiency. The corresponding NC films also show enhanced stability at elevated temperature and also in humid atmosphere. Consequently, the PbWO 4 -modified NCs-based LED exhibits a pronounced improvement of electroluminescence with an external quantum efficiency from 0.2% to 5.7% and twofold enhancement of the operational lifetime through PbWO 4 passivation in comparison with that of pristine CsPbBr 3 NCs-based LED. These results show a promising pathway by ME-induced anionic modification for high-performance and stable LEDs based on perovskite NCs.
研究领域:
材料科学
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光学工程
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DOI
Journal of Materials Research and Technology-JMR&T
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2026
·
IF 7.3
Zhipeng Huo,Jie Zhang,Zuoyang Chen,Guoqiang Zhong
Flexible silicone rubber (SR) composites doped with different reinforcing fillers are prepared for nuclear fusion facility penetration sealing and shielding against neutrons and gamma rays. Scanning Electron Microscope (SEM) reveals that micron spindle-shaped PbWO 4 fillers have much smaller particle sizes and more uniform size distribution. The experimental results indicate that the thermal resistance and mechanical performance of the spindle-PbWO 4 reinforced SR are superior to the other composites, with the maximum decomposition temperature of 490.1 °C, tensile strength of 0.92 MPa and compressive strength of 5.32 MPa. Moreover, the spindle-shaped PbWO 4 filler significantly reduces the thermal expansion behavior of the composite, which is more conducive to improving the thermal stability. This is attributed to its restraining effect on the thermal vibrations and relative displacements of the polymer chain of the matrix. Due to the ultraviolet absorption ability of PbWO 4 , the tensile strength loss of the PbWO 4 filler-reinforced SR after 60 days of accelerated ultraviolet aging is significantly less than the other composites. SuperMC simulation demonstrates the superior synergistic neutron and gamma ray shielding capability of the spindle-PbWO 4 /B 4 C/SR composite and its effectiveness in reducing secondary gamma ray generation. At a thickness of 15 cm, the spindle-PbWO 4 /B 4 C/SR composite respectively achieves shielding rates of 93.13% against 252 Cf neutrons and 82.76% against 137 Cs gamma rays, and it exhibits optimal shielding parameters ( Σ = 0.167 cm −1 , μ m = 0.080 cm 2 /g and μ = 0.117 cm −1 ). The spindle-PbWO 4 /B 4 C/SR composite offers the best radiation shielding and meets the mechanical and airtightness requirements for sealing fusion device penetrations.
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52335
·
IF 3.057
Hao Zhang,Ying Jun Li,Jun Zeng,Hui Ping Liu,Yuan Lin Zhou
In order to solve the problem of poor thermal conductivity of polymer-based radiation shielding composite materials, h-BN@PDA@PbWO 4 hybrid powders were prepared by combining h-BN with high thermal conductivity and PbWO 4 with γ shielding. With the assistance of polydopamine, PbWO 4 particles were synthesized in situ on the h-BN surface. The effects of h-BN@PDA@PbWO 4 on thermal conductivity, γ-ray shielding, and mechanical properties of chloroprene rubber were studied. The results showed that the hybrid particles had better dispersibility than the pure mixing of h-BN and PbWO 4 in chloroprene rubber and significantly improved the thermal conductivity gamma-ray shielding performance and mechanical properties of CR composites. When the filler content of the hybrid powder reaches 40 wt%, the thermal conductivity of the composite is about 3.16 times that of the pure CR. The γ shielding rates at 86.5 KeV and 105.3 KeV photon energies increase by 14.14% and 17.61% compared with the pure CR. Compared with pure CR, the tensile strength of the composites increased by 4.79 MPa, and the elongation at break decreased slightly. These were because h-BN@PDA@PbWO 4 shows had an excellent synergistic effect in CR substrate. The new kind of CR/h-BN@PDA@PbWO 4 composite can be used for thermal management and gamma shielding.
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DOI
高影响因子
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